Silencer for exhaust-pipes.



I. M. COTTRELL L G; BIMBER. SILENGEB. FOR EXHAUSTPIPBS.

BBLI'OATION FILED JUNEzs, 1912.

Patented Apr. ,15, 1913.

` ym-mim@ UNITEDsTATEs PATENT oEEioE.

'IEvINa M. coTTRELL, 0E WEST soMERvILLE, AND GEORGE B11/IEEE, or EAST BosToiv,

" MASSACHUSETTS. l

- y sILENCEE ron EXHAUS'.r-rIrEsl i Toiall whom 'zfmay conceive I Be it known that we', I-RvING M. COTTRELL and GEORGE BIMBER, citizens of the United States, residing, respectively, at aWest Somerville and East Boston, in the counties of Middlesex and Suffolk, respectively, State Aof Massachusetts, have invented new and in construction, occupies a very smal amount of space, and 1s soconstructed as Dto practicallyeliminate vibration dueto the force of the exhaust. v

The invention consists of the features of construction, combination and arrangement of parts, hereinafter fully described and claimed, reference being had to the accompanying drawing, in which: a

Figure 1 is a fragmentary ront'elevation of an exhaust pipe showing theV device attached thereto. Fig. 2 is a longitudinal sectional view taken `on thev'line 2-2 of Fig. 1. Fig. 3 is a detail perspective view of 'one of the tixed cones. Fig. 4 is a similar perspective View of one of the movable.

cones.

In the drawing, 1 designates the hollow, cylindrical body of the silencer which is provided at its ends with external screvs7 threads adapted to receive thecouplings 2 and 3 which connect the samefin the exhaust pipe line. A hollow, truncated cone 4 provided at its edges .with a peripheral ange 5 isadapted to be positioned'within each end of the silencer body so `that the said flange engagesthe edge thereof. The end wall 6 of eachof these xed cones is provided with a threaded opening 7 adapted to receive one threaded end 8 of a longitudinally extending, centrally disposed bearing pipe 9 which. connects the two cones to secure the same in fixed position against the ends of the body 1.- Each of the fixed cones is provided adjacent its flanged edge with a cut-away portion 1() for the reception of the point of an adjusting Spanner which is used in removing or tightening the same. Each of the said cones is further provided with a plurality of parallel, longitudinally Specification of Letters latent.

Patented Apr. 15,1913.

Application led J une 2B, 1912. Serial No. 706,011.

extending perforations 11 through which the exhaust gases pass in their t-ravelthrough the silencer body. Adjacent the inner end of each fixed cone, a pair of movable cones 12 and 13 are mounted upon the bearing tube 9 with the latter passing through openrespectively, to the said cones.

each other, and the reduced end 17 ofy the cone 13 also abuts the reduced en d of the adjacent {ixed cone. The cone 13"has a pluralit-y of-rpa'rallel, longitudinally extending iperforations 20 provided in its tapering side Wall, and which are out of alinement with the perforations in the adjacent fixed cone.

The innermostcone 12 of each pair of movable cones Vis provided with a plurality lof similar perf-orations 21 which are also out of alinement 'With the perforations in the coact-ing cone 18. A helical spring 22 surrounds the central portion of'the bearing tube 9 in interposed relation 'to the two innermost movable cones 12, 'so as to normally maintain the said cones in separated position with respect to each other and in closely abutting position With respectto their coacting cones 13, the 'latter being thus held in engagement with the iixed cones 4.

In. the operation ofthe device, it will be seen that upon the passage of exhaust gas into the silencer body through either end thereof, the said gas Will pass through the perforations in the fixed cone at that end of the body and will then become rapidly diffused as it passes through the non-alining perforations' 'in the movable cone and the fixed cone in the other end of the body. As the gas passes through the body it will force the movable cones adjacent the end which it enters toward the opposite end of the body lingsllt and 15 in the end Walls 16 and 17, i The free 'edges 18 and 19 of the cones closely abut against the action of the extensile spring.

The degree of slidable movement of these movable cones-Will depend upon the force of the exhaust. In practice it has been vfound that thetorce of the exhaust is completely diffused Without causinggreat vibration of the parts of the device, they being constructed of comparatively heavy metal, and further thatthere is very little back pressure due'to the large number of-perforations in the cones, and to the fact that they extend parallel to the longitudinal axis of thevbody.

What is claimed is: p 1". A device of the class described comprislos ing a hollow cylindrical body, and a plurality of cone-shaped baille members provided i J therein and having longitudinally extending `rality of cone members slidably mounted upon saidfbody.

5. A'device of the class described comprising a hollow cylindrical body, a guidel member disposed within said'body, a plurality of cone members slidably mounted upon said guide member, and means tending to maintain the innermost pair of cone members in separated position.

6. A device of the class described comprising a hollow cylindrical body, a guide member positioned centrally Within saidbody, a

plurality of cone members slidably mounted upon said guide member, and means carried by said guide 'member for normally maintaining the central pair of cone members in separated position.

7. A deviceof the class described com- 'pris'ing a hollow cylindrical body, a fixed cone member' disposed within each end of,4

the said body, means on each of said cones for limiting the forward movement thereof,

y a bearing tube detachablysecured at its ends to said cone and extending longitudinally and centrally with respect to the said body,

Va plurality of movable cones slidably mounted upon said tube,V and resilient means car.- ried by said tube for normally maintaining said movable cone in'extended position.

8. A device of the class described coinprising a hollow, cylindrical body having its ends open, a ixed perforated cone projecting into said body through each of its ends, and a plurality of perforated cones slidably mounted within said body.

' 9. A device ofthe class,` described comprising a, hollow cylindrical ,body having .its ends open, a perforated, hollow cone fixedly mounted in each end of said body, a centrally disposed, longitudinallyl extending bearing tube having its ends detachably secured to each of said fixed cones, a pair of perforated, hollow cones Y disposedy adjacent the inner ends of each fixed -cone'and slidably mounted upon the said tube withr their free edges abutting each other, and resilient means for normally maintaining said airs of movable cones i-n spaced relation wit respect to each other.

' In testimony whereof weaix our signatures in presence of two witnesses.

' IRVING M. COTTRELL.

GEORGE BIMBER. 1 Witnesses:

MARY MARTIN, JAMES H. CLINE. 

